20030179 Ver 6_Monitoring Report_20081006

Duke
Energy.
Carolinas
September 26, 2008
Mr. John Dorney
NC Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
HYDRO STRATEGY & LICENSING
Duke Energy Carolinas, LLC
EC12YI526 South Church Street
Charlotte, NC 28202-1802
Mailing Address:
EC12Y/P.O. Box 1006
Charlotte, NC 28201-1006
Subject: Dillsboro Hydroelectric Project's July and August Water Quality Monitoring Reports
Mr. Dorney:
Enclosed are the July and August pre-dam removal water quality monitoring reports for the
Dillsboro Project. These data are provided per the 401 Water Quality Certification with
Additional Comments dated November 21, 2007. If you have questions regarding these reports,
please do not hesitate to give me a call at 704/382-0805.
Sincerely,
D. Hugh Barwick
Senior Environmental Resource Manager
Enclosure: Reports

?
A o
?1

o ti Z%
6
DILLSBORO HYDROELECTRIC PROJECT
(FERC No. 2602)
JULY 2008 WATER QUALITY REPORT
Prepared for:
DUKE ENERGY CAROLINAS, LLC
Charlotte, North Carolina
Prepared by:
DEVINE TARBELL & ASSOCIATES, INC.
Charlotte, North Carolina
SEPTEMBER 2008

Devine Tarbell & Associates, Inc.
Consulting Engineers, Scientists, & Rcguls.. s' is ivts
DILLSBORO HYDROELECTRIC PROJECT (FERC No. 2602)
JULY 2008 WATER QUALITY REPORT
TABLE OF CONTENTS
Section Title Page No.
SECTION I INTRODUCTION ......................................................................................... I
SECTION 2 WATER QUALITY SAMPLING LOCATIONS .................................................3
SECTION 3 MONTHLY WATER QUALITY SAMPLING DATA .........................................4
APPENDICES
APPENDIX A - MAP OF WATER QUALITY MONITORING LOCATIONS
APPENDIX B - PHOTOS
APPENDIX C - FLOWS
•
0
DILLSBORO HYDROELECTRIC PROJECT (FERC No. 2602)
JULY 2008 WATER QUALITY REPORT
LIST OF TABLES
Table Title Page No.
TABLE 1 APPROXIMATE FLOWS ON JULY 17, 2008 (CFS) ...........................................5
TABLE 2 WATER QUALITY DATA COLLECTED ON JULY 17, 2008 ............................5
•
ii
Section 1
Introduction
This report details and summarizes the monthly water quality results at the Dillsboro
Hydroelectric Project (FERC No. 2602) (the Project) for the month of July 2008. The Project is
located in southwestern North Carolina on the Tuckasegee River in Jackson County, and
includes a dam, reservoir, and powerhouse. The Dillsboro Dam and Powerhouse are located at
approximately River Mile (RM) 31.6. During the preparation of the Project relicensing
application, a considerable amount of information was obtained on environmental resources
within the Project area. Since that time, a License Surrender Application was submitted to the
FERC, and Duke Energy Carolinas, LLC (Duke Energy) is taking initiatives to mitigate for the
various impacts of decommissioning the Project. The environmental resource information
gathered for the relicensing application is currently being used by Duke Energy and Devine
Tarbell & Associates, Inc. (DTA) for the monitoring program in preparation for the removal of
Dillsboro Dam.
The Dillsboro Dam removal project includes a three-phase environmental monitoring effort. The
current, or Pre-Removal Phase, is being used to gather baseline information on the variability of
physical, chemical, and biological processes in the Tuckasegee River prior to dam removal. To
capture seasonal effects, this phase has been designed to occur the year prior to, and leading up
to, dam removal. Pre-Removal Phase Monitoring will include the relocation of downstream
mussel populations to areas above the Dillsboro Project with known mussel populations. Dam
Removal Monitoring will take place during the actual dam demolition and removal period, which
will include environmental parameter threshold triggers to maintain ambient conditions. Post-
Dam Removal Monitoring will assess specific physical, chemical, and biological changes in the
Project area to determine when the river system has returned to background ambient conditions.
The current Pre-Removal Phase spans from January to December of 2008 and this report details
the water quality portion of the overall environmental monitoring program for July 2008. The
purpose of the Pre-Removal Phase is to gain an understanding of baseline conditions, and the
associated seasonal variability of those conditions, in the Tuckasegee River through the year.
The water quality parameters of this study include temperature, dissolved oxygen (DO), specific
Section 1
Introduction
conductance, pH, turbidity, and total suspended solids (TSS). These measurements are being
collected monthly to document these baseline conditions, and ultimately, for comparison with
water quality data collected during the removal and post-removal phases, and for comparison
with historical data.
•
•
2
Section 2
Water Quality Sampling Locations
The locations of the water quality sampling sites were selected based on agency consultation and
previous study locations. There are nine water quality sampling locations near Dillsboro Dam
(see Figure A-1 in Appendix A). Photos of each water quality sampling location are included in
Appendix B.
The water quality monitoring study includes sections of river both above and below Dillsboro
Dam and covers about 2.5 river miles on the Tuckasegee River.
¦ M-1L and M-1R are below Dillsboro Dam at river mile 31.1. M-1L is located on the left
bank ascending and M-1R is located on the right bank ascending. The right and left banks
at M-1 are monitored separately because of the change in water quality across the river
from the influence of Scott's Creek. Scott's Creek is just upstream of M-1 on the left
bank.
40 ¦ M-2 is located in Scott's Creek approximately 0.1 mile upstream of the confluence with
the Tuckasegee River.
¦ M-3 is located just below Dillsboro Dam at river mile 31.5.
¦ M-4 is at river mile 31.7, just above the dam in Dillsboro Pond at river mile 31.7.
¦ M-5L and M-5R are located on the left and right banks ascending, respectively, in a riffle
just upstream of Dillsboro Pond at river mile 32.8 (M-5R was added after the January
sampling trip). The right and left banks at M-5 are monitored separately to study the
influence of the Tuckasegee Water and Sewer Authority (TWSA). TWSA's discharge
point is located just upstream of M-5 on the left bank.
¦ M-6 is located on Savannah Creek, just upstream of the confluence with the Tuckasegee
River.
¦ M-7 is located on the mainstem Tuckasegee River, just upstream of Savannah Creek at
river mile 33.6.
•
3
Section 3
Monthly Water Quality Sampling Data
Mainstem Tuckasegee River flows were recorded at two nearby USGS stream flow measuring
gauges on July 17, 2008, the day when water quality sampling took place. These stream gauges
are:
¦ USGS Gauge 03508050 Tuckasegee River at SR 1172 near Cullowhee, NC; and
¦ USGS Gauge 03510577 Tuckasegee River at Barker's Creek, NC.
Flow data from the USGS gauges is included in Table C-1 in Appendix C. In addition to flow
data collected at USGS gauges, DTA measured the flows at two main tributaries within the study
area: Savannah Creek and Scott's Creek. These tributary flows were measured at the same time
that water quality sampling took place (Table C-2 in Appendix C). The approximate flow at
each mainstem site during the time that the water quality data was collected was determined
based on a combination of flows measured at the USGS gauge near Cullowhee and the tributary
flows measured by DTA. Flows measured at the upstream Cullowhee gauge (RM 47.0) were
increased by 8% to account for the additional drainage area between the gauge and Savannah
Creek. The timing of the flow was then adjusted from the gauge location to each water quality
monitoring location based on a previous travel time study. The flow measured at Savannah
Creek was then added to monitoring locations between Savannah Creek and Scott's Creek. For
water quality monitoring locations below Scott's Creek, both Savannah Creek and Scott's Creek
measured flows were added to the adjusted mainstem flow. The resulting approximate flows for
each water quality monitoring location are provided below in Table 1.
At each of the water quality sampling sites, temperature, DO, specific conductance, pH,
turbidity, and TSS were measured. The water quality sampling parameters are summarized in
Table 2. The water quality instrument used in this study was a Hydrolab® MSS. The Hydrolab
was calibrated in a laboratory in June 2008, including a Winkler Titration. DTA checked the
calibration of the Hydrolab against known standards prior to, and after, the July sampling trip.
•
4
Section 3 Monthly Water Quality Sampling Data
TABLE 1
APPROXIMATE FLOWS ON JULY 17, 2008 (CFS)
Location Description July
M-11, Left ascending bank below Scott's Creek (RM 31.1) 580
M-1R Right ascending bank below Scott's Creek (RM 31.1) 580
M-2 Scott's Creek 33
M-3 Below Dillsboro Dam (RM 31.5) 545
M-4 Above Dillsboro Dam (RM 31.7) 545
M-5L Left ascending bank above Dillsboro Pond (RM 32.8) 545
M-511 Right ascending bank above Dillsboro Pond (RM 32.8) 545
M-6 Savannah Creek 25
M-7 Above Savannah Creek (RM 33.6) 520
TABLE 2
WATER QUALITY DATA COLLECTED ON JULY 17, 2008
•
Temp DO Cond pH Turb TSS
Location Description (degrees C m /I Si units NTU m /L
M-11, Left ascending bank below 19.05 8.86 28 5.60 7.25 12
Scott's Creek (RM 31.1)
M-111 Right ascending bank below 18.88 8.79 23 6.11 7.45 12
Scott's Creek RM 31.1)
M-2 Scott's Creek 22.06 8.91 44 7.73 7.45 10
Below Dillsboro Dam (RM
M-3 18.84 8.61 22 6.21 8.50 10
31.5)
Above Dillsboro Dam (RM
M-4 19.13 8.81 21 6.23 6.80 9
31.7)
Left ascending bank above
M-5L
Dillsboro Pond RM 32.8) 19.57 8.50 27 6.36 7.60 10
Right ascending bank above
M-5R
Dillsboro Pond RM 32.8) 20.63 8.63 24 7.17 8.90 10
M-6 Savannah Creek 20.14 8.57 32 6.67 7.75 8
Above Savannah Creek (RM
M-7 19.94 8.56 20 6.41 6.90 9
33.6)
Note: Total suspended solids samples were analyzed by the Duke Energy Analytical Laboratory at the McGuire Nuclear
Complex in Huntersville, North Carolina. This laboratory is certified by the North Carolina Division of Water Quality.
0
Section 3 Monthly Water Quality Sampling Data
According to standards set by the North Carolina Division of Water Quality, the upper end of the
study reach (Savannah Creek to Dillsboro Dam) is classified as Class C freshwaters/trout, and
the study reach below Dillsboro Dam is classified as Class C freshwaters. All of the water
quality parameters collected during July 2008 were within the set limits for Class C
freshwaters/trout above the dam and Class C freshwaters below the dam.
All DO values were above water quality limits for Class C freshwaters/trout above the dam (6
mg/L daily average; 5 mg/L daily minimum) and for Class C freshwaters below the dam (5 mg/L
daily average; 4 mg/L daily minimum). Specific conductance values were highest in the two
tributaries and at the mainstem water quality sampling locations just downstream from the
tributaries. Turbidity values were all within state standards (10 NTUs above the dam and 50
NTUs below the dam). TSS values in July tended to slightly increase as the sampling proceeded
downstream likely due to the inflows of the two tributaries.
As part of the Pre-Removal Phase Monitoring study, DTA plans to collect water quality data in a
variety of flows, including a stormwater runoff event. This will demonstrate how the water
quality in the Tuckasegee River changes during normal seasonal storm events.
•
6
•
APPENDICES

0

APPENDIX A
MAP OF WATER QUALITY MONITORING LOCATIONS
i
0
•
E
•
APPENDIX B
PHOTOS
•
40
•
I"?1
Photo B-2: M-2, Scott's Creek
0
Photo B-1: M-1L, Left Ascending Bank below Scott's Creek (RM 31.1)

0
Photo B-3: M-3, Below Dillsboro Dam (RM 31.5)
u
Photo B-4: M-4, Above Dillsboro Dam (RM 31.7)
•
•
' r
?-
f
¦ -xr-

,H
77
-`1

0
Photo B-5: M-5L, Left Ascending Bank above Dillsboro Pond (RM 32.8)
IM
l
�� E•`LMiYY;*
.p

r?
..

•
Photo B-8: M-7, Above Savannah Creek (RM 33.6)

0
•
APPENDIX C
FLOWS
•
11
The table below provides recorded flows at these USGS stream gauges. The date of the
sampling trip is included, as well as the weather conditions.
TABLE C-1
FLOWS ON JULY 17, 2008
Weather Conditions: Sunnv. 85 decrees
Cullowhee Barker's Creek Oconaluftee Bryson City
Time Stage
ft Discharge
cfs Stage
ft Discharge
cfs Stage
ft Discharge
cfs Stage
ft Discharge
cfs
11:00 5.44 476 3.16 215 1.15 178 1.74 442
11:15 5.41 464 3.20 227 1.15 178 1.74 442
11:30 5.31 425 3.61 372 1.15 178 1.74 442
11:45 5.15 365 3.88 496 1.15 178 1.74 442
12:00 4.94 293 3.93 521 1.15 178 1.74 442
12:15 4.77 240 3.93 521 1.15 178 1.76 458
12:30 4.61 196 3.94 527 1.15 178 1.79 481
12:45 4.48 161 3.94 527 1.15 178 1.82 505
13:00 4.37 134 3.94 527 1.15 178 1.84 521
13:15 4.29 117 3.94 527 1.15 178 1.85 530
13:30 4.22 102 3.94 527 1.15 178 1.85 530
13:45 4.15 88 3.94 527 1.15 178 1.85 530
14:00 4.11 81 3.94 527 1.15 178 1.85 530
14:15 4.06 73 3.94 527 1.15 178 1.84 521
14:30 4.02 66 3.94 527 1.15 178 1.84 521
In addition, tributary flows near Dillsboro Dam were measured as part of the water quality
monitoring at Savannah Creek and Scott's Creek. Flows were measured manually using a hand
held Swoffer velocity meter and topset wading rod.
TABLE C-2
TRIBUTARY FLOW MEASUREMENTS
Tributary Date and Time Flow (cfs)
Savannah Creek 7/17/08 13:00 25
Scott's Creek 7/17/08 14:15 33
•
•

0

N
00
N
Y ?
?
?
bD
C_ N
?
a
U
z R o
?
y -
a N
?
?
O 3
U
R
C N

= 00
N
a
rl y ti ?
WW 6?
AI ?
N N R
M
A
? U O
W5
y
CQ
u y N
F U
O ? o
? a
O N

y
bD
CQ L

p ?
O
o
M
(' ?
U c?

? 0 0
fi o

0
M
O
r
O
O O O O O O O O O O O O
O O? 00 !?
O
?
V1 ? M N

•
•
v
c3
'O
b0
G
.a
C
7
a
v
3
i y
y

L -p
C6
E
L :C
U o;
W ?
r
I?
7?1
?
O
C

? R
u

? U
D ¦
1
v
v
y
1
3
0
u.
I

0
0
N
N
00
O
O
N
h
N
r
00
O
O
N
h
N
v
00
0
N
70
N
70
O
C
N
N
7
00
0
o
N
N Q
M
0
0
N
N
N
00
O
O
N
Q\?
N
h
O
O
N
O
M
N
h
O
O
N
0
M
h
O
O
N
M
O
h
O
O
f`1
O ?
0
? ? O O O
N N
L'
DILLSBORO HYDROELECTRIC PROJECT
(FERC No. 2602)
AUGUST 2008 WATER QUALITY REPORT
DUKE ENERGY CAROLINAS, LLC
Charlotte, North Carolina
Prepared by:
DEVINE TARBELL & ASSOCIATES, INC.
Charlotte, North Carolina
SEPTEMBER 2008
TA
Devine Tarbell & Associates, Inc.
• C-tddng Engineer., Scientisa, & Regula?l Sped d6ft
Prepared for:
• DILLSBORO HYDROELECTRIC PROJECT (FERC No. 2602)
AUGUST 2008 WATER QUALITY REPORT
TABLE OF CONTENTS
Section Title Page No.
SECTION I INTRODUCTION .........................................................................................I
SECTION 2 WATER QUALITY SAMPLING LOCATIONS .................................................3
SECTION 3 MONTHLY WATER QUALITY SAMPLING DATA .........................................4
APPENDICES
APPENDIX A - MAP OF WATER QUALITY MONITORING LOCATIONS
APPENDIX B - PHOTOS
APPENDIX C - FLOWS
0

DILLSBORO HYDROELECTRIC PROJECT (FERC No. 2602)
AUGUST 2008 WATER QUALITY REPORT
LIST OF TABLES
Table Title Page No.
TABLE I APPROXIMATE FLOWS ON AUGUST 27, 2008 (CFS) .....................................5
TABLE 2 WATER QUALITY DATA COLLECTED ON AUGUST 27, 2008 .....................5
•
0
Section I
Introduction
This report details and summarizes the monthly water quality results at the Dillsboro
Hydroelectric Project (FERC No. 2602) (the Project) for the month of August 2008. The Project
is located in southwestern North Carolina on the Tuckasegee River in Jackson County, and
includes a dam, reservoir, and powerhouse. The Dillsboro Dam and Powerhouse are located at
approximately River Mile (RM) 31.6. During the preparation of the Project relicensing
application, a considerable amount of information was obtained on environmental resources
within the Project area. Since that time, a License Surrender Application was submitted to the
FERC, and Duke Energy Carolinas, LLC (Duke Energy) is taking initiatives to mitigate for the
various impacts of decommissioning the Project. The environmental resource information
gathered for the relicensing application is currently being used by Duke Energy and Devine
Tarbell & Associates, Inc. (DTA) for the monitoring program in preparation for the removal of
Dillsboro Dam.
The Dillsboro Dam removal project includes a three-phase environmental monitoring effort. The
current, or Pre-Removal Phase, is being used to gather baseline information on the variability of
physical, chemical, and biological processes in the Tuckasegee River prior to dam removal. To
capture seasonal effects, this phase has been designed to occur the year prior to, and leading up
to, dam removal. Pre-Removal Phase Monitoring will include the relocation of downstream
mussel populations to areas above the Dillsboro Project with known mussel populations. Dam
Removal Monitoring will take place during the actual dam demolition and removal period, which
will include environmental parameter threshold triggers to maintain ambient conditions. Post-
Dam Removal Monitoring will assess specific physical, chemical, and biological changes in the
Project area to determine when the river system has returned to background ambient conditions.
The current Pre-Removal Phase spans from January to December of 2008 and this report details
the water quality portion of the overall environmental monitoring program for August 2008. The
purpose of the Pre-Removal Phase is to gain an understanding of baseline conditions, and the
associated seasonal variability of those conditions, in the Tuckasegee River through the year.
The water quality parameters of this study include temperature, dissolved oxygen (DO), specific
Section 1 Introduction
conductance, pH, turbidity, and total suspended solids (TSS). These measurements are being
collected monthly to document these baseline conditions, and ultimately, for comparison with
water quality data collected during the removal and post-removal phases, and for comparison
with historical data.
•
•
2
Section 2
Water Quality Sampling Locations
The locations of the water quality sampling sites were selected based on agency consultation and
previous study locations. There are nine water quality sampling locations near Dillsboro Dam
(see Figure A-1 in Appendix A). Photos of each water quality sampling location are included in
Appendix B.
The water quality monitoring study includes sections of river both above and below Dillsboro
Dam and covers about 2.5 river miles on the Tuckasegee River.
¦ M-1L and M-1R are below Dillsboro Dam at river mile 31.1. M-IL is located on the left
bank ascending and M-1R is located on the right bank ascending. The right and left banks
at M-1 are monitored separately because of the change in water quality across the river
from the influence of Scott's Creek. Scott's Creek is just upstream of M-1 on the left
bank.
¦ M-2 is located in Scott's Creek approximately 0.1 mile upstream of the confluence with
the Tuckasegee River.
¦ M-3 is located just below Dillsboro Dam at river mile 31.5.
¦ M-4 is at river mile 31.7, just above the dam in Dillsboro Pond at river mile 31.7.
¦ M-5L and M-5R are located on the left and right banks ascending, respectively, in a riffle
just upstream of Dillsboro Pond at river mile 32.8 (M-5R was added after the January
sampling trip). The right and left banks at M-5 are monitored separately to study the
influence of the Tuckasegee Water and Sewer Authority (TWSA). TWSA's discharge
point is located just upstream of M-5 on the left bank.
¦ M-6 is located on Savannah Creek, just upstream of the confluence with the Tuckasegee
River.
¦ M-7 is located on the mainstem Tuckasegee River, just upstream of Savannah Creek at
river mile 33.6.

3
Section 3
Monthly Water Quality Sampling Data
Mainstem Tuckasegee River flows were recorded at two nearby USGS stream flow measuring
gauges on August 27, 2008, the day when water quality sampling took place. These stream
gauges are:
¦ USGS Gauge 03508050 Tuckasegee River at SR 1172 near Cullowhee, NC; and
¦ USGS Gauge 03510577 Tuckasegee River at Barker's Creek, NC.
Flow data from the USGS gauges is included in Table C-1 in Appendix C. In addition to flow
data collected at USGS gauges, DTA measured the flows at two main tributaries within the study
area: Savannah Creek and Scott's Creek. These tributary flows were measured at the same time
that water quality sampling took place (Table C-2 in Appendix Q. The approximate flow at
each mainstem site during the time that the water quality data was collected was determined
. based on a combination of flows measured at the USGS gauge near Cullowhee and the tributary
flows measured by DTA. Flows measured at the upstream Cullowhee gauge (RM 47.0) were
increased by 8% to account for the additional drainage area between the gauge and Savannah
Creek. The timing of the flow was then adjusted from the gauge location to each water quality
monitoring location based on a previous travel time study. The flow measured at Savannah
Creek was then added to monitoring locations between Savannah Creek and Scott's Creek. For
water quality monitoring locations below Scott's Creek, both Savannah Creek and Scott's Creek
measured flows were added to the adjusted mainstem flow. The resulting approximate flows for
each water quality monitoring location are provided below in Table 1.
At each of the water quality sampling sites, temperature, DO, specific conductance, pH,
turbidity, and TSS were measured. The water quality sampling parameters are summarized in
Table 2. The water quality instrument used in this study was a Hydrolab® MSS. The Hydrolab
was calibrated in a laboratory in June 2008, including a Winkler Titration. DTA checked the
calibration of the Hydrolab against known standards prior to, and after, the August sampling trip.
•
4
•
Section 3
Monthly Water Quality Sampling Data
TABLE 1
APPROXIMATE FLOWS ON AUGUST 27, 2008 (CFS)
Location Description August
M-1L Left ascending bank below Scott's Creek (RM 31.1) 1090
M-1R Right ascending bank below Scott's Creek (RM 31.1) 1090
M-2 Scott's Creek 98
M-3 Below Dillsboro Dam (RM 31.5) 990
M-4 Above Dillsboro Dam (RM 31.7) 990
M-5L Left ascending bank above Dillsboro Pond (RM 32.8) 990
M-5R Right ascending bank above Dillsboro Pond (RM 32.8) 990
M-6 Savannah Creek 51
M-7 Above Savannah Creek (RM 33.6) 940
TABLE 2
WATER QUALITY DATA COLLECTED ON AUGUST 27, 2008
•
Location Description Temp DO Cond pH Turb TSS
(degrees C) (mg/L) ( Si) (units) (NTU) (mg/L)
M-11- Left ascending bank below
' 16.89 8.65 26 6
37 42
5 64
Scott
s Creek (RM 31.1) . .
M- I R Right ascending bank below
' 16.38 8.79 21 7
00 48
8 73
Scott
s Creek (RM 31.1) . .
M-2 Scott's Creek 19.80 8.13 43 7.10 18.1 44
M-3 Below Dillsboro Dam (RM 16.29 8.80 21 6
84 40
6 58
31.5) . .
M-4 Above Dillsboro Dam (RM 16.85 8
53 26 6
68 36
4 50
31.7) . . .
M-51- Left ascending bank above 16.04 8.71 24 6
74 28
9 48
Dillsboro Pond (RM 32.8) . .
M-5R Right ascending bank above 17,36 8.62 25 6
88 19
3 36
Dillsboro Pond (RM 32.8) . .
M-6 Savannah Creek 20.03 8.09 40 7.06 22.8 30
M-7 Above Savannah Creek (RM 16.14 8
80 20 7
17 22
0 44
33.6) . . .
mnc. nnai suspenueu sonas samples were analyzeci ny me vuKe Cnergy Analytical Laboratory at the McGuire Nuclear Complex in
Huntersville, North Carolina. This laboratory is certified by the North Carolina Division of Water Quality.
The water quality sampling trip took place on August 27, 2008. On August 25 and August 26,
the two days preceding this sampling trip, the USGS precipitation gauge at Bryson City recorded
daily rainfall totals of 1.75 and 1.78 inches, respectively. The water quality data collected during
this high flow runoff condition will be valuable for background information regarding
stormwater runoff events. According to standards set by the North Carolina Division of Water
Quality, the upper end of the study reach (Savannah Creek to Dillsboro Dam) is classified as
0 Class C freshwaters/trout, and the study reach below Dillsboro Dam is classified as Class C
5
40 Section 3 Monthly Water Quality Sampling Data
freshwaters. With the exception of turbidity readings above Dillsboro Dam, all of the water
quality parameters collected during August 2008 were within the set limits for Class C
freshwaters/trout above the dam and Class C freshwaters below the dam.
All DO values were above water quality limits for Class C freshwaters/trout above the dam
(6 mg/L daily average; 5 mg/L daily minimum) and for Class C freshwaters below the dam
(5 mg/L daily average; 4 mg/L daily minimum). Specific conductance values in the two
tributaries were substantially higher than the values measured in the mainstem. Even with the
increased rainfall runoff flows, turbidity values at sampling locations below Dillsboro Dam were
all within the state standard of 50 NTUs. However, the sampling locations above Dillsboro Dam
all turbidity values exceeded the state standard of 10 NTUs.
As part of the Pre-Removal Phase Monitoring study, DTA plans to continue to collect water
quality data in a variety of flows. This will demonstrate how the water quality in the Tuckasegee
Is River changes during normal seasonal storm events.
•
6
•
APPENDICES
s
0
•
APPENDIX A
MAP OF WATER QUALITY MONITORING LOCATIONS
•
0
•
Rim

•
APPENDIX B
PHOTOS
0
0
•
0
Photo B-1: M-1L, Left Ascending Bank below Scott's Creek (RM 31.1)
Photo B-2: M-2, Scott's Creek
•
•
•
Photo B-3: M-3, Below Dillsboro Dam (RM 31.5)
Photo B-4: M-4, Above Dillsboro Dam (RM 31.7)
E
•
•
Photo B-5: M-5L, Left Ascending Bank above Dillsboro Pond (RM 32.8)
Photo B-6: M-5R, Right Ascending Bank above Dillsboro Pond (RM 32.8)
•
Ll
9
Photo B-7: M-6, Savannah Creek
Photo B-7: M-7, Above Savannah Creek (RM 33.6)
APPENDIX C
FLOWS
11
0
The table below provides recorded flows at these USGS stream gauges. The date of the
10 sampling trip is included, as well as the weather conditions.
TABLE C-1
FLOWS ON AUGUST 27, 2008
Weather Conditions: Partly sunny, 75 degrees
•
Cullowhee Barker's Creek Oconaluftee Br son City
Time Stage
(ft) Discharge
(cfs) Stage
(ft) Discharge
(cfs) Stage
(ft) Discharge
(cfs) Stage
(ft) Discharge
(cfs)
11:45 6.25 839 4.93 1250 1.96 572 3.57 2,580
12:00 6.22 825 4.92 1240 1.95 565 3.55 2,550
12:15 6.18 805 4.91 1230 1.94 558 3.51 2,490
12:30 6.20 815 4.90 1220 1.93 551 3.50 2,470
12:45 6.16 795 4.89 1210 1.92 545 3.47 2,430
13:00 6.15 791 4.87 1190 1.90 531 3.46 2,410
13:15 6.12 776 4.87 1190 1.89 525 3.43 2,370
13:30 6.14 786 4.86 1190 1.88 518 3.41 2,340
13:45 6.13 781 4.86 1190 1.87 512 3.38 2,290
14:00 6.13 781 4.84 1170 1.86 506 3.35 2,250
14:15 6.13 781 4.83 1160 1.85 500 3.35 2,250
14:30 6.18 805 4.83 1160 1.84 494 3.34 2,240
14:45 6.12 776 4.82 1150 1.83 488 3.33 2,220
15:00 6.11 771 4.81 1140 1.82 482 3.32 2,210
15:15 6.12 776 4.81 1140 1.82 482 3.30 2,180
15:30 6.14 786 4.80 1130 1.81 476 3.29 2,160
15:45 6.11 771 4.79 1120 1.80 470 3.27 2,140
16:00 6.12 776 4.79 1120 1.79 464 3.25 2,110
16:15 6.14 786 4.78 1110 1.78 458 3.23 2,080
16:30 6.11 771 4.77 1100 1.77 453 3.23 2,080
16:45 6.16 795 4.77 1100 1.77 453 3.22 2,070
In addition, tributary flows near Dillsboro Dam were measured as part of the water quality
monitoring at Savannah Creek and Scott's Creek. Flows were measured manually using a hand
held Swoffer velocity meter and topset wading rod.
TABLE C-2
TRIBUTARY FLOW MEASUREMENTS
Tributary Date and Time Flow (cfs)
Savannah Creek 8/27/08 15:30 51
Scott's Creek 8/27/08 16:45 98
•
•
•
?I
U
T
W
r_V
F+?
n
J
t
'O
Y
3

C
C
U
n
C
U
¦
^.J
5
C
U
:e
3
0
u..

0
N
JO
r
N
r
N
OC
?l
N
00
N RS
M A
00
O
N
N
rn
N
r
rl
r
0
M
r
M.
j
I ?
_ j
O O O O O G ? O O C v
? ? ? r O it, ? M N
(MR MOIA
•
•
9
7
y
y

?Q c
d
L 4

W v ,
ix aio ?

C7
rrI?_
F+?I ?
V i u

? p

r

Y
'J
J
t.
U
Y
co
3
fc.
(sia) MOIrj
x
c
N
x

ri
(`d
r
x
N
r
N
10
x
x
?n
00
x

x
y
r'l
A
M
x
\I
x
N
N
x
0
0
N
r
N
j
M
r
0
r
0
0
N
r'.
r
N

0 0 0 0
0 o c o 0